scott



(No Model.)

G. J. SCOTT Steam-Boiler.

No. 228,783. Patented June15, 1880.

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NITED STATES PATENT OFFICE.

GEORGE J. SCOTT, OF OAIJOUTTA, INDIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 228,783, dated June 15, 1880. Application filed April 6,1880. (No model.) Patented in England April 27, 1876.

To all whom it may concern Be it known that I, GEORGE JAMIESON SCOTT, of Calcutta, in the Empire of India, have invented Improvements in Steam-Boilers, of which the following is a specification.

This invention, which relates to improvements in boilers, is applicable either to land or marine boilers using muddy or dirty water.

The invention has for its object to prevent or lessen the incrustation or deposit on the heating-surface of boilers of the mud or dirt which passes in with the feed-water and remains in the boiler after the water is evaporated or converted into steam.

The boiler constructed in accordance with this invention (shown in longitudinal section at Figure 1, and in part transverse section and part end elevation at Fig. 2 of the appended drawings) consists of four cylindrical or tubular steam-generators, A, fitted internally with tubes B, for the passage to the uptake of the products of combustion from the combustionchambers, communicating with the inner ends ofthe furnaces or fire-grates 0. My invention, however, is equally well adapted to boilers constructed with only two generators, (half the number shown in the drawings,) the construction shown necessitating a simple duplication of the essential elements of the invention, hereinafter set forth.

At the lower part each generator is provided with a deep vertical hollow leg or member, D, extending throughout its entire length, or

. through a part of the length thereof, and on each side of these legs the furnaces O are placed,the fire-bars of the said furnaces being situated at a level above the lower ends of the hollow legs or members, which may be of any desired depth and breadth, according to the circumstances under which the boiler is to be employed. By means of this arrangement the mud or dirt passing into the boiler with the feed-water settles down to the bottom of the hollow legs-that is to say, below the level of the fire-bars, where, being beneath the heat ing-surface, there is less danger of the boiler burning, and, consequently, lessened risk of explosion. The accumulated mud or dirt may from time to time be removed by opening the blow-oflf cocks of the boiler, these being placed on the hollow legs or members D, or the mud may be removed by scrapers or other equivalent means.

Instead of employing four generators, A, as

seen on the drawings, any other desired number may be used, these being either situated in parallel rows divided transversely through the center by the wall F, or otherwise suitably arranged, and by placing the fire-grates underneath and between the generators a large amount of heating-surface is derived from the external shell of the boiler, which, in ordinary multitubular boilers is not available. This arrangement also permits the space at the interior of the boiler generally occupied by the furnaces to be filled with tubes, thus also giving a greater internal heating-surface than is obtained in a multitubular boiler of similar diameter as hitherto constructed.

A steam-boiler consisting of two or more return-flue generators, each having a hollow leg or member, D, at the bottom 'of and extending longitudinally along the generators, and furnace or furnaces 0, arranged underneath and between the generators, substantially as and for the purpose set forthi In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

GEORGE JAMIESON seen. 1,. s]

Witnesses:

ALGERNON F. NoWELL WATKINS,

Solicitor and Notary Public, Calcutta, India.

CHARLES BRADFORD WATKINS, Of Calcutta, Clerk to the above. 

